Structural-Energy Aspect of the Friction Coefficient

IF 0.5 4区 工程技术 Q4 ENGINEERING, MECHANICAL
S. V. Fedorov
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Abstract

Over five centuries, friction science used the friction coefficient as the main quantitative characteristic of the friction process. The concept of the friction coefficient as a characteristic of resistance to the movement of frictional surfaces in a latent form was formulated by Leonardo da Vinci. Two centuries later, already in an explicit form, as a formula, the friction coefficient appeared in the studies of Guillaume Amonton. Modern engineering believes that the friction coefficient has no physical meaning, it is merely a convenient friction parameter that can be easily determined in an experiment. What is the physical meaning of resistance to the movement of frictional surfaces? If we perform a thermodynamic analysis of the friction process, considering each deformable friction contact element as an independent transformer and dissipator of energy of the external relative displacement (motion) of surfaces, then it becomes possible to consider the friction coefficient in a new physical sense. The accumulation of the potential energy of a deformed structure (defects in the crystalline structure) by a friction contact is, in essence, a method of deceleration of frictional surfaces moving relative to each other. The static potential energy of the formed defects in the structure of the contact structure is a measure of the decrease in the kinetic energy of the relative motion of the frictional surfaces. The pragmatism of the energy (thermodynamic) approach of friction is organically embedded in the general problems of energy consumption and saving energy resources of modern tribology.

Abstract Image

摩擦系数的结构能量方面
五个多世纪以来,摩擦科学将摩擦系数作为摩擦过程的主要定量特征。列奥纳多·达·芬奇提出了摩擦系数的概念,认为摩擦系数是对潜在形式的摩擦表面运动的阻力的特征。两个世纪后,摩擦系数作为一个公式已经以明确的形式出现在纪尧姆·阿蒙顿的研究中。现代工程认为,摩擦系数没有物理意义,它只是一个方便的摩擦参数,可以在实验中很容易地确定。摩擦表面运动阻力的物理意义是什么?如果我们对摩擦过程进行热力学分析,将每个可变形的摩擦接触元件视为表面外部相对位移(运动)能量的独立变换器和耗散器,那么就有可能从新的物理意义上考虑摩擦系数。通过摩擦接触来积累变形结构(晶体结构中的缺陷)的势能本质上是一种使相对于彼此移动的摩擦表面减速的方法。在接触结构的结构中形成的缺陷的静态势能是摩擦表面的相对运动的动能减小的量度。摩擦的能量(热力学)方法的实用主义有机地嵌入了现代摩擦学的能源消耗和节约能源的一般问题中。
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来源期刊
Journal of Friction and Wear
Journal of Friction and Wear ENGINEERING, MECHANICAL-MATERIALS SCIENCE, MULTIDISCIPLINARY
CiteScore
1.50
自引率
28.60%
发文量
21
审稿时长
6-12 weeks
期刊介绍: Journal of Friction and Wear is intended to bring together researchers and practitioners working in tribology. It provides novel information on science, practice, and technology of lubrication, wear prevention, and friction control. Papers cover tribological problems of physics, chemistry, materials science, and mechanical engineering, discussing issues from a fundamental or technological point of view.
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